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Validate Operating Point Against Specifications

When you compute an operating point based on input, output, or state
specifications, the Simulink®
Control Design™ software indicates whether the specifications were successfully met
during the trimming process. If the trimming was unsuccessful, to determine the
specifications that could not be met, you must validate your trimmed operating
point against the original specifications.

Validate Operating Point in Steady State Manager

When you compute an operating point using Steady State Manager,
the software creates an operating point report object and highlights any
operating point values that violate the constraints in the
specification.

For example, consider the scdairframeTRIM model. Open the
model and set the speed and incidence angle parameters.

To open Steady State Manager, in the Simulink model window, select Analysis > Control Design > Steady State Manager.

Create a trim specification for the model. On the Steady
State tab, click Trim
Specification.

In the spec1 document, specify which states are known
and which are at steady state.

To trim the model, on the Specification tab, click
Trim. The software generates an operating point report and,
in the corresponding report1 document, highlights any
constraint violations.

The optimization search could not find an operating point that satisfies the
specifications. As highlighted in Steady State Manager, the three
states specified to be at steady state are not. The highlighted state values
violate the specified constraints by more than the tolerance value specified
on the Report tab, in the Validation
Tolerance field. For steady-state conditions, the
dx Minimum and dx Maximum
constraints are both zero; that is, the rate of change for each state is
zero. In the trimmed operating point, the Actual dx
values violate these constraints.

For this model, specifying the second position state to be at steady state
overconstrains the system, making a steady-state solution impossible.

To remove this steady-state constraint, update the specification. In the
spec1 document, in the Steady
State column, clear the corresponding row.

On the Specification tab, click
Trim. The software trims the model and opens a corresponding
reports tab.

You can also validate an existing operating point against a set of
specifications. For example, to check if the model initial conditions
satisfy the requirements in spec1, first create an
operating point based on the model initial conditions. On the
Steady State tab, click Operating
Point. The software creates an operating point and opens a
corresponding op1 document.

To validate this operating point against the specifications in
spec1, on the Operating Point
tab, under Validate Against, select
spec1.

The software creates an operating point report and opens a corresponding
report3 tab.

The model initial conditions do not satisfy the operating point
specifications.

Validate Operating Point in Linear Analysis Tool

When you compute an operating point using Linear Analysis Tool,
the software does not highlight constraint violations. Instead, you must
inspect the operating point report information for any violations.

If you trim the model from the preceding Steady State Manager
example using the same specifications in the Linear Analysis
Tool, the software creates an operating point in the Data
Browser, in the Linear Analysis
Workspace.

To check whether the operating point satisfies the specified constraints, in
the Data Browser, in the Linear Analysis
Workspace, double-click the operating point.

In the Edit dialog box, for the three steady-state specifications, the
trimmed state values in the Actual dx column violate
the zero Desired dx values.

Validate Operating Point at the Command Line

When you compute an operating point at the command line, the findop function outputs an operating point report to the Command Window by default. You can also return the operating point report as an output argument. For more information, see findop. To validate your operating point against the specifications, you must check whether the operating point values satisfy the constraints.

For example, open the scdairframeTRIM model and set the model parameters.

In the operating point search report, the dx values for the specified steady states have zero constraints, as indicated by the 0 value in parentheses. The optimization search did not find a steady-state operating point, since all three of these states violate the constraints.

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